Petromium Tools / Formula set TDRAG-001
Torque & Drag
3D quasi-static soft-string planning · pickup / rotating / slack-off kept separate· V2.0
Animated calculation view
Trajectory, contact, and load profiles
Vertical string configuration
surface · section composition and critical intervals
Axial load profile
Tension positive · compression negative · measured depth downward
Review · not an approval
Surface load comparison
Pickup indicated hookload
223.1 klbf
Rotating indicated hookload
172.3 klbf
Slack-off indicated hookload
115.3 klbf
Rotating surface torque
10.8 klbf-ft
All assumptions remain editable
Torque and drag worksheet
Buoyancy basis
Selected buoyancy factor: 0.816826
Boundary loads and tare
Positive axial force is tension; negative is compression. Tare is separate from every downhole force profile.
Minimum-curvature survey
MD increases from the declared top reference. No uncertainty or tortuosity smoothing is inferred.
String tally — bit upward
Lengths must sum to bit MD. Effective contact OD remains explicit.
Wellbore intervals — top downward
Cased, open-hole, and riser factors retain separate provenance.
Optional user-entered limits
The tool does not derive API ratings or select these limits. Enabled values affect margins only.
Optional measured surface values
Calculation complete
Calculation audit
Pickup drag
50.8 klbf
Slack-off drag
56.9 klbf
Max tension
173.1 klbf
Min axial force
-24.1 klbf
Calculation observations
Results use a quasi-static soft-string model; stiffness, buckling, dynamics, hydraulics, and marine-riser structural effects are excluded.
Negative axial force is reported as a soft-string compression observation, not a buckling or reach approval.